LP#1537233 Copy bucket handles mis-scans, improve focus

LP#1537233 Copy bucket handles mis-scans, improve focus

Show warning message to user when an unknown barcode is scanned in the
copy bucket pending list UI.  Also, after a barcode failure occurs, select
the barcode text (instead of clearing it) so it can be seen and easily
replaced, consistent with the item status UI.

After successful scan, clear and re-focus the barcode input box.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Cesar Velez <cesar.velez@equinoxinitiative.org>
Signed-off-by: Kathy Lussier <klussier@masslnc.org>